libstdc++-v3/libsupc++/pbase_type_info.cc

   1 // Copyright (C) 1994-2014 Free Software Foundation, Inc.
   2 //
   3 // This file is part of GCC.
   4 //
   5 // GCC is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 3, or (at your option)
   8 // any later version.
   9
  10 // GCC is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // Under Section 7 of GPL version 3, you are granted additional
  16 // permissions described in the GCC Runtime Library Exception, version
  17 // 3.1, as published by the Free Software Foundation.
  18
  19 // You should have received a copy of the GNU General Public License and
  20 // a copy of the GCC Runtime Library Exception along with this program;
  21 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22 // <http://www.gnu.org/licenses/>.
  23
  24 #include "tinfo.h"
  25
  26 namespace __cxxabiv1 {
  27
  28 __pbase_type_info::
  29 ~__pbase_type_info ()
  30 {}
  31
  32 bool __pbase_type_info::
  33 __do_catch (const type_info *thr_type,
  34             void **thr_obj,
  35             unsigned outer) const
  36 {
  37   if (*this == *thr_type)
  38     return true;      // same type
  39
  40 #ifdef __GXX_RTTI
  41   if (typeid (*this) != typeid (*thr_type))
  42     return false;     // not both same kind of pointers
  43 #endif
  44
  45   if (!(outer & 1))
  46     // We're not the same and our outer pointers are not all const qualified
  47     // Therefore there must at least be a qualification conversion involved
  48     // But for that to be valid, our outer pointers must be const qualified.
  49     return false;
  50
  51   const __pbase_type_info *thrown_type =
  52     static_cast <const __pbase_type_info *> (thr_type);
  53
  54   if (thrown_type->__flags & ~__flags)
  55     // We're less qualified.
  56     return false;
  57
  58   if (!(__flags & __const_mask))
  59     outer &= ~1;
  60
  61   return __pointer_catch (thrown_type, thr_obj, outer);
  62 }
  63
  64 }